Abstr:UFR 2-14: Difference between revisions
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= Abstract = | = Abstract = | ||
The investigation of the bidirectional coupling between a fluid flow | |||
and a structure motion is a growing branch of research in science | |||
and industry. Applications of so-called fluid-structure interactions | |||
(FSI) are widespread. To improve coupled numerical FSI simulations, | |||
generic experimental benchmark studies of the fluid and the | |||
structure are necessary. In this work, the coupling of a | |||
vortex-induced periodic deformation of a flexible structure mounted | |||
behind a rigid cylinder and a fully turbulent water flow performed | |||
at a Reynolds number of \mbox{Re = $30,470$} is experimentally | |||
investigated with a planar particle image velocimetry (PIV) and a | |||
volumetric three-component velocimetry (V3V) system. To determine | |||
the structure displacements a multiple-point laser triangulation | |||
sensor is used. The three-dimensional fluid velocity results show | |||
shedding vortices behind the structure, which reaches the second | |||
swiveling mode with a frequency of about \mbox{$11.2$ Hz} | |||
corresponding to a Strouhal number of \mbox{St = $0.177$}. Providing | |||
phase-averaged flow and structure measurements precise experimental | |||
data for coupled computational fluid dynamics (CFD) and | |||
computational structure dynamics (CSD) validations are available for | |||
this new benchmark case denoted FSI-PfS-2a. The test case possesses | |||
four main advantages: (i) The geometry is rather simple; (ii) | |||
Kinematically, the rotation of the front cylinder is avoided; (iii) | |||
The boundary conditions are well defined; (iv) Nevertheless, the | |||
resulting flow features and structure displacements are challenging | |||
from the computational point of view. In addition to the flow field | |||
and displacement data a PIV-based force calculation method is used | |||
to estimate the lift and drag coefficients of the moving structure. | |||
Revision as of 07:15, 17 December 2013
Fluid-structure interaction II
Flows Around Bodies
Underlying Flow Regime 2-14
Abstract
The investigation of the bidirectional coupling between a fluid flow and a structure motion is a growing branch of research in science and industry. Applications of so-called fluid-structure interactions (FSI) are widespread. To improve coupled numerical FSI simulations, generic experimental benchmark studies of the fluid and the structure are necessary. In this work, the coupling of a vortex-induced periodic deformation of a flexible structure mounted behind a rigid cylinder and a fully turbulent water flow performed at a Reynolds number of \mbox{Re = $30,470$} is experimentally investigated with a planar particle image velocimetry (PIV) and a volumetric three-component velocimetry (V3V) system. To determine the structure displacements a multiple-point laser triangulation sensor is used. The three-dimensional fluid velocity results show shedding vortices behind the structure, which reaches the second swiveling mode with a frequency of about \mbox{$11.2$ Hz} corresponding to a Strouhal number of \mbox{St = $0.177$}. Providing phase-averaged flow and structure measurements precise experimental data for coupled computational fluid dynamics (CFD) and computational structure dynamics (CSD) validations are available for this new benchmark case denoted FSI-PfS-2a. The test case possesses four main advantages: (i) The geometry is rather simple; (ii) Kinematically, the rotation of the front cylinder is avoided; (iii) The boundary conditions are well defined; (iv) Nevertheless, the resulting flow features and structure displacements are challenging from the computational point of view. In addition to the flow field and displacement data a PIV-based force calculation method is used to estimate the lift and drag coefficients of the moving structure.
Contributed by: Andreas Kalmbach, Guillaume De Nayer, Michael Breuer — Helmut-Schmidt Universität Hamburg
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